ABSTRACT
The radioactive safety of drinking water has attracted increasing public concern. The newly issued Standards for Drinking Water Quality (GB5749-2022) in China has revised the radiological parameters. This article provides an overview of the main sources, levels of radionuclides in drinking water, and summarized the individual doses criterion and adverse health effects associated with exposure of the public to radionuclides from drinking-water. It analyzes and discusses the relevant revision content of radiological parameters, including the guidance values for screening gross α and gross β, subtracting the contribution of potassium-40 from gross β activity when the gross β activity concentration exceeds the screening level, and the basis for establishing the limit values of reference indices uranium and radium-226. Specific implementation and evaluation suggestions are also proposed.
Subject(s)
Humans , China , Drinking Water , Radioisotopes/analysis , Uranium/analysis , Water SupplyABSTRACT
With the rapid development of nuclear medicine, the number of nuclear medical staff has increased a lot in the past few years in China. Close-range operations, such as preparation and injections of radiopharmaceuticals, are usually carried out in nuclear medicine department. And the use of unsealed radionuclides may also create internal exposure risk. So, occupational exposure of nuclear medical staff is a main issue of occupational health management in China. In this paper, the occupational exposure level and requirements for radiation protection of nuclear medical staff are introduced to provide references for the related work that radiological health technical institutions carry out.
Subject(s)
Humans , Radiation Protection , China , Medical Staff , Occupational Exposure/prevention & control , Occupational HealthABSTRACT
As compulsory standards in occupational health, the diagnostic criteria for occupational diseases are the main basis for the diagnosis of occupational diseases. According to the Occupation Disease Classification and Catalogue in China, there are currently 13 kinds of legal occupational radiation diseases in China. There are 14 supporting diagnostic criteria, including the GBZ 104-2017 Diagnosis of Acute Radiation Sickness from Occupational External Exposure, GBZ 99-2002 Diagnostic Criteria for Subacute Radiation Sickness from External Exposure, GBZ 105-2017 Diagnosis of Chronic Radiation Sickness from Occupational External Exposure, GBZ 96-2011 Diagnostic Criteria for Radiation Sickness from Internal Exposure, GBZ 106-2020 Diagnosis for Occupational Radiation Diseases of Skin, GBZ 97-2017 Judgment Standard for Occupational Radiogenic Neoplasms, GBZ 100-2010 Diagnostic Criteria for External Radiation Bone Injury, GBZ 101-2020 Diagnosis for Occupational Radiation Thyroid Disease, GBZ 107-2015 Diagnosis for Occupational Radiation Induced Gonad Disease, GBZ 102-2007 Diagnostic Criteria of Combined Radiation-blast Injury, GBZ 103-2007 Diagnostic Criteria of Combined Radiation-burn Injury, GBZ 95-2014 Diagnostic Criteria for Occupational Radiation Cataract, GBZ 108-2002 Diagnostic Criteria for Acute Uranium Intoxication and GBZ 112-2017 General Guideline for Diagnosis of Occupational Radiation Diseases. Compared with previous criteria, some of the new criteria changed a lot in terms of diagnostic conditions, included diseases, dose threshold and calculation methods for etiological probability. The science and practicability improved continually, which is conducive to standardize the diagnosis of occupational radiation diseases.
ABSTRACT
OBJECTIVE: To investigate the effects of long-term and low dose ionizing radiation on ocular lens opacities of residents living in areas with high natural radiation background(HNRB) in Yangjiang City, China. METHODS: A total of 483 Han residents from Yangjiang City(HNRB area) and 517 from Enping City(control area) were selected as study subjects using a cluster random sampling method. Questionnaire survey and lens examination were carried out. The risk factors of lens opacity and its severity were analyzed by logistic regression analysis. RESULTS: The prevalence rates of lens opacity, cortical opacity and posterior subcapsular opacity in HNRB area were higher than those in control area(60.7% vs 51.6%, 53.4% vs 46.8%, 21.9% vs 9.3%, all P<0.05). There was no significant difference in karyotype turbidity between HNRB area and control area(52.4% vs 47.6%, P>0.05). After adjusting for confounding factors including age, gender, cardiovascular/metabolic diseases, smoking, alcohol drinking and tea drinking, the unconditional logistic regression analysis results showed that the risk of ocular opacity, cortical opacity and posterior subcapsular opacity in residents of HNRB area was higher than that in control area(all P<0.05). Multivariate disordered logistic regression analysis results showed that residents in the HNRB area had a higher risk of grade two karyotype turbidity than grade one karyotype turbidity(P<0.01). Ordered logistic regression analysis results showed that residents in HNRB area had an increased risk of developing severe cortical turbidity(P<0.01). CONCLUSION: Long-term and low dose ionizing radiation exposure may increase the risk of ocular lens opacity, especially cortical and posterior subcapsular cataract, and affect the severity of the disease.